How do i model this plastic handle?
This is how I would do it:


Create a bezier curve for the in the shape of the handle's profile. Life is easier if you put the object's origin at one end.





Create another curve in the shape of the handle.  To simplify things, I left the origin at the World Center and used a mirror modifier. 

With the handle shape selected, go into the Curve properties, Geometry section and create a bevel, using the profile curve as the bevel object.



That should give you the basic geometry.  You could convert to mesh, add a solidify modifier and make any tweaks you wanted from there.